* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --gold: #FFD700;
    --gold-bg: #FFF9E6;
    --gold-border: #F5D000;
    --silver: #C0C0C0;
    --silver-bg: #F5F5F5;
    --silver-border: #B0B0B0;
    --bronze: #CD7F32;
    --bronze-bg: #FDF5EE;
    --bronze-border: #C07030;
    --primary: #6366F1;
    --primary-light: #EEF2FF;
    --text-primary: #1F2937;
    --text-secondary: #6B7280;
    --text-muted: #9CA3AF;
    --bg-white: #FFFFFF;
    --bg-light: #F9FAFB;
    --bg-card: #FFFFFF;
    --border-color: #E5E7EB;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --radius: 12px;
    --radius-lg: 16px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #F0F4FF 0%, #FAFBFF 50%, #F5F0FF 100%);
    min-height: 100vh;
    color: var(--text-primary);
    line-height: 1.5;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 24px 16px;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 16px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    font-size: 32px;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.logo h1 {
    font-size: 28px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary) 0%, #8B5CF6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-info {
    text-align: right;
}

.last-updated {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-secondary);
    justify-content: flex-end;
}

.update-dot {
    width: 8px;
    height: 8px;
    background: #10B981;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.8); }
}

.auto-refresh {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 4px;
}

.filters-bar {
    display: flex;
    gap: 24px;
    margin-bottom: 20px;
    padding: 16px 20px;
    background: var(--bg-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    flex-wrap: wrap;
}

.filter-toggle {
    display: flex;
    align-items: center;
    gap: 10px;
}

.filter-label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
}

.toggle {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
}

.toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #D1D5DB;
    transition: 0.3s;
    border-radius: 24px;
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: 0.3s;
    border-radius: 50%;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.toggle input:checked + .toggle-slider {
    background-color: var(--primary);
}

.toggle input:checked + .toggle-slider:before {
    transform: translateX(20px);
}

.stats-bar {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.stat {
    background: var(--bg-card);
    padding: 20px;
    border-radius: var(--radius);
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.stat-value {
    display: block;
    font-size: 28px;
    font-weight: 700;
    color: var(--primary);
}

.stat-label {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
    margin-top: 4px;
    display: block;
}

.leaderboard-container {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.leaderboard-header {
    display: grid;
    grid-template-columns: 80px 1fr 100px;
    padding: 16px 24px;
    background: var(--bg-light);
    border-bottom: 1px solid var(--border-color);
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

.leaderboard {
    min-height: 400px;
}

.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 80px 20px;
    color: var(--text-secondary);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-bottom: 16px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.team-row {
    display: grid;
    grid-template-columns: 80px 1fr 100px;
    padding: 16px 24px;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.2s ease;
}

.team-row:last-child {
    border-bottom: none;
}

.team-row:hover {
    background-color: var(--bg-light);
}

.team-row.gold {
    background: linear-gradient(90deg, var(--gold-bg) 0%, var(--bg-card) 100%);
    border-left: 4px solid var(--gold);
}

.team-row.silver {
    background: linear-gradient(90deg, var(--silver-bg) 0%, var(--bg-card) 100%);
    border-left: 4px solid var(--silver);
}

.team-row.bronze {
    background: linear-gradient(90deg, var(--bronze-bg) 0%, var(--bg-card) 100%);
    border-left: 4px solid var(--bronze);
}

.rank {
    font-weight: 700;
    font-size: 18px;
    color: var(--text-secondary);
}

.team-row.gold .rank {
    color: #B8860B;
}

.team-row.silver .rank {
    color: #71717A;
}

.team-row.bronze .rank {
    color: var(--bronze);
}

.rank-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    font-size: 16px;
}

.team-row.gold .rank-badge {
    background: linear-gradient(135deg, #FFD700 0%, #FFA500 100%);
    box-shadow: 0 2px 8px rgba(255, 215, 0, 0.4);
}

.team-row.silver .rank-badge {
    background: linear-gradient(135deg, #E8E8E8 0%, #B0B0B0 100%);
    box-shadow: 0 2px 8px rgba(192, 192, 192, 0.4);
}

.team-row.bronze .rank-badge {
    background: linear-gradient(135deg, #DDA15E 0%, #BC6C25 100%);
    box-shadow: 0 2px 8px rgba(205, 127, 50, 0.4);
}

.team-name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 15px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    padding-right: 16px;
}

.donor-count {
    font-weight: 700;
    font-size: 18px;
    color: var(--primary);
    text-align: right;
}

.team-row.gold .donor-count {
    color: #B8860B;
}

.team-row.silver .donor-count {
    color: #71717A;
}

.team-row.bronze .donor-count {
    color: var(--bronze);
}

.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
    margin-top: 24px;
    padding: 16px;
    background: var(--bg-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.page-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.page-btn:hover:not(:disabled) {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.page-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.page-info {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.footer {
    text-align: center;
    margin-top: 32px;
    padding: 16px;
    color: var(--text-muted);
    font-size: 12px;
}

.no-data {
    text-align: center;
    padding: 80px 20px;
    color: var(--text-secondary);
}

.no-data svg {
    width: 64px;
    height: 64px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.error-message {
    text-align: center;
    padding: 40px 20px;
    color: #EF4444;
}

@media (max-width: 640px) {
    .container {
        padding: 16px 12px;
    }

    .header {
        flex-direction: column;
        text-align: center;
    }

    .header-info {
        text-align: center;
    }

    .last-updated {
        justify-content: center;
    }

    .logo h1 {
        font-size: 22px;
    }

    .stats-bar {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .stat {
        padding: 16px;
    }

    .stat-value {
        font-size: 24px;
    }

    .leaderboard-header {
        grid-template-columns: 60px 1fr 80px;
        padding: 12px 16px;
        font-size: 11px;
    }

    .team-row {
        grid-template-columns: 60px 1fr 80px;
        padding: 12px 16px;
    }

    .team-name {
        font-size: 14px;
    }

    .donor-count {
        font-size: 16px;
    }

    .pagination {
        flex-wrap: wrap;
    }

    .page-btn {
        padding: 8px 16px;
        font-size: 13px;
    }
}